Cutting device and chamfering machine comprising the same

ABSTRACT

The present invention relates to a cutting device and a chamfering machine comprising the same, and according to one aspect of the present invention, a cutting device for use in a chamfering process of a film laminate is provided, in which the cutting device comprises a rotating wheel having a rotation center; and a cutting bite comprising a main body mounted on the rotating wheel and a cutting tip provided on the main body and provided to perform chamfering of the film laminate by rotating the rotating wheel, wherein the cutting bite is mounted on the rotating wheel such that the central axis of the cutting tip is inclined at a first angle with respect to the tangential direction of a rotation locus of the cutting bite formed by rotating the rotating wheel.

TECHNICAL FIELD

The present invention relates to a cutting device and a chamferingmachine comprising the same and, more particularly, to a cutting devicefor chamfering a film laminate and a chamfering machine comprising thesame.

BACKGROUND ART

A chamfering machine has been used to cut a film for display to adesired size.

FIG. 1 is a conceptual diagram for explaining a general chamferingprocess.

Referring to FIGS. 1a and 1b , as a type of the chamfering machine, aface cut (F/C) type as shown in FIG. 1a and an end mill (E/D) type asshown in FIG. 1b have been used. At this time, in the case of the F/Ctype chamfering machine (10), cutting devices (20) are each provided onboth sides of a film laminate (F) in a transfer direction, in which thecutting device (20) comprises a rotating wheel (21) and a plurality ofcutting bites (22) mounted on the rotating wheel (21). Here, thechamfering method proceeds in such a manner that when the cutting bitesrotate by rotating the rotating wheel (12), the film laminate (F) iscut.

FIG. 2 is a conceptual diagram for explaining a chamfering method usingthe conventional chamfering machine (10) as shown in FIG. 1(a).Referring to FIG. 2, in the case of the cutting device (20) for the F/Cchamfering machine conventionally used, there is a problem to causemicrocracks on the film laminate (F) according to cutting positions (A,B, C) of the cutting bite (22) along a thickness direction of the filmlaminate (F). The transfer direction of the film laminate (F) is fromright to left, based on FIG. 2, where at the points A and B, relativelysevere cracks are generated on the film laminate (F), and it isunderstood that this is because the cutting direction and the transferdirection are opposite at the positions A and B, so that the interactiveforce increases.

DISCLOSURE Technical Problem

It is a technical problem of the present invention to provide a cuttingdevice capable of reducing stress acting on a film laminate regardlessof a cutting position along a thickness direction of the film laminateduring chamfering, and a chamfering machine comprising the same.

It is another technical problem of the present invention to provide acutting device capable of preventing occurrence of cracks and defects inthe film laminate during chamfering, and a chamfering machine comprisingthe same.

Technical Solution

To solve the above problems, according to one aspect of the presentinvention, a cutting device for use in a chamfering process of a filmlaminate is provided, in which the cutting device comprises a rotatingwheel having a rotation center; and a cutting bite comprising a mainbody mounted on the rotating wheel and a cutting tip provided on themain body and provided to perform chamfering of the film laminate byrotating the rotating wheel.

Here, the cutting bite is mounted on the rotating wheel such that thecentral axis of the cutting tip is inclined at a first angle withrespect to the tangential direction of a rotation locus of the cuttingbite formed by rotating the rotating wheel.

In addition, the cutting bite is inclined so that the cutting tip isdisposed closer to a rotation center of the rotating wheel than the casethat the central axis of the cutting tip is parallel to the tangentialdirection.

Also, the first angle may be 20° to 35°.

Furthermore, the first angle may be 30°.

The cutting tip may be also provided such that a cutting line contactingwith the film laminate along the rotation direction of the rotatingwheel is formed as a curved line, but the central part has a convexshape protruded outward than both side edges.

Alternatively, the cutting tip may be provided such that a cutting linecontacting with the film laminate along the rotation direction of therotating wheel is formed as a curved line, but the central part has aconcave shape recessed inward than both side edges.

Furthermore, the cutting tip may be provided such that the cutting linehas a symmetrical shape with respect to the central axis.

In addition, according to another aspect of the present invention, acutting device for use in a chamfering process of a film laminate isprovided, in which the cutting device comprises a rotating wheel havinga rotation center; and a plurality of cutting bites mounted on therotating wheel, wherein the plurality of cutting bites are mounted apartalong the circumferential direction of the rotating wheel, each cuttingbite comprises a main body mounted on the rotating wheel and a cuttingtip provided on an apical part of the main body and provided to performchamfering by rotating the rotating wheel while maintaining a contactcondition with the film laminate, and the cutting bite is mounted on therotating wheel such that the central axis of the cutting tip is inclinedat a first angle with respect to the tangential direction of a rotationlocus of the cutting bite formed by rotating the rotating wheel.

Furthermore, the plurality of cutting bites may be mounted at the sameangular interval along the circumferential direction of the rotatingwheel.

In addition, at least two cutting bites may be each mounted at differentdistances from the rotation center along the radial direction of therotating wheel.

Also, at least two cutting bites may be each mounted at the samedistance from the rotation center along the radial direction of therotating wheel.

Also, each cutting bite may be provided such that the cutting tip isexposed in the same direction based on the rotation direction of therotating wheel.

Also, the cutting bite is inclined so that the cutting tip is disposedcloser to the rotation center of the rotating wheel than the case thatthe central axis of the cutting tip is parallel to the tangentialdirection.

Also, the first angle may be 20° and 35°.

Also, the first angle may be 30°.

Furthermore, according to another aspect of the present invention, achamfering machine is provided, which comprises a transfer unit fortransferring a film laminate, the cutting devices disposed on both sidesalong a transfer direction of the transfer unit, respectively and adrive part for rotating the cutting devices.

Effects of Invention

As described above, the cutting device associated with one example ofthe present invention and the chamfering machine comprising the samehave the following effects.

It is possible to reduce microcracks generated on the film laminateduring chamfering and to reduce the maximum stress applied to the filmlaminate.

BRIEF DESCRIPTION OF DRAWINGS

FIGS. 1a and 1b are conceptual diagrams for explaining a generalchamfering process, respectively.

FIG. 2 is a conceptual diagram for explaining a chamfering method usingthe chamfering machine as shown in FIG. 1(a).

FIGS. 3a and 3b are perspective views of the cutting device associatedwith one example of the present invention, respectively.

FIG. 4 is a plan view for explaining a rotation locus of the cuttingbite as shown in FIGS. 3a and 3 b.

FIGS. 5a to 5d are conceptual diagrams for explaining an installationangle of the cutting bite as shown in FIG. 4, respectively.

FIG. 6 is a graph for explaining effects according to the installationangle of the cutting bite.

FIG. 7 is a side view of the cutting bite associated with the presentinvention.

FIG. 8 is a perspective view of the cutting bite as shown in FIG. 7.

FIGS. 9a and 9b are front views of the cutting bite as shown in FIG. 7,respectively.

DETAILED DESCRIPTION OF INVENTION

Hereinafter, a cutting device according to one example of the presentinvention and a chamfering machine comprising the same will be describedin detail with reference to the accompanied drawings.

In addition, the same or corresponding components regardless ofreference numerals are given by the same or similar reference numerals,for which the redundant description will be omitted, and for convenienceof explanation, the size and shape of each constituent member as shownin the drawings may be exaggerated or reduced.

FIGS. 3a and 3b are perspective views showing the cutting device (100)associated with one example of the present invention, respectively, andFIG. 4 is a plan view for explaining a rotation locus (R) of the cuttingbite (200) as shown in FIGS. 3a and 3 b.

In addition, FIGS. 5a to 5d are conceptual diagrams for explaining aninstallation angle of the cutting bite (200) as shown in FIG. 4,respectively, and FIG. 6 is a graph for explaining effects according tothe installation angle of the cutting bite (200). In particular, FIG. 5shows the installation angle (θ) of the cutting bite (200) at theposition B of FIG. 4.

Furthermore, FIG. 7 is a side view of the cutting bite (200) associatedwith the present invention, FIG. 8 is a perspective view of the cuttingbite (200) as shown in FIG. 7, and FIGS. 9a and 9b are front views ofthe cutting bite (200) as shown in FIG. 7, respectively.

The chamfering machine for a film laminate associated with one exampleof the present invention comprises a transfer unit for transferring thefilm laminate (F, see FIG. 1), cutting devices (100) disposed on bothsides along the transfer direction of the transfer unit, respectivelyand a drive part for rotating the cutting devices (100). For example,the transfer unit may comprise a conveyor belt, and the drive part maycomprise a motor.

The cutting device (100) associated with one example of the presentinvention is a cutting device (100) used in a chamfering process of afilm laminate (F), in which the cutting device (100) comprises arotating wheel (110) and a cutting bite (200). In addition, thechamfering machine comprises a pair of cutting devices (100), where thepair of rotating wheels (110) are provided to be opposite to both sidesof the film laminate (F) in the feed direction (transfer direction).Also, the pair of rotating wheels (110) are arranged to perform thechamfering process on both sides (S) of the film laminate (F).

The rotation wheel (110) has a rotation center (C) and is rotated by adrive part based on the rotation center (C).

The cutting bite (200) comprises a main body (210) mounted on therotating wheel (110) and a cutting tip (220) provided on the main body(210) and provided to perform chamfering of the film laminate (F) byrotating the rotating wheel (110). Specifically, the cutting tip (220)is provided at an apical part of the main body (210) to performchamfering while maintaining a contact condition with the film laminate(F) by rotating the rotation wheel (110). At least some region of themain body (210) is inserted and fixed to the rotating wheel (110), thecutting tip (220) is disposed to be exposed to the outside and thecutting line (221) of the cutting tip (220) is provided to face therotation direction of the rotating wheel (100).

The cutting device (100) may comprise a plurality of cutting bites(200). Specifically, the cutting device (100) includes a plurality ofcutting bites (200) mounted apart on the rotating wheel (110) at apredetermined angle along the circumferential direction (rotationdirection). Here, each cutting bite (200) may have the same structure.Here, each cutting bite (200) may be provided such that the cutting tip(220) is exposed in the same direction based on the rotation directionof the rotating wheel (110).

In addition, the plurality of cutting bites (200) may be mounted at thesame angular intervals along the circumferential direction of therotating wheel (110). Also, 3 to 6 cutting bites (200) may be mounted onthe rotating wheel (110). At least two cutting bites (200) may also bemounted at different distances from the rotation center (C) along theradial direction of the rotating wheel (110), respectively. In thisconfiguration, at least two cutting bites (200) may have rotation loci(R) of different turning radii by rotating the rotating wheel (110). Atleast two cutting bites (200) may also be mounted at the same distancefrom the rotation center (C) along the radial direction of the rotatingwheel (110), respectively. In this configuration, at least two cuttingbites (200) may have rotation loci (R) of different turning radii byrotating the rotating wheel (110).

Besides, the cutting bite (200) is mounted on the rotating wheel (110)through a fastening means. In particular, each cutting bite (200) ismounted such that the fastening means is inserted into the rotatingwheel (110) along the radial direction of the rotating wheel (110),respectively. A mounting hole (211), on which the fastening means ismounted, is formed on the main body (210) of the cutting bite (200).

In addition, the cutting tip (220) may form cutting lines (221, 221′) ofcurves contacting with the film laminate (F) along the rotationdirection of the rotating wheel (110). For example, referring to FIG. 9a, the cutting tip (220) may be also provided so that the central part ofthe cutting line (221) has a convex shape protruded outward than bothside edges. In this case, the cutting tip (220) may be provided suchthat based on an imaginary straight line connecting both side edges ofthe cutting line (221), the cutting line (221) as a whole is locatedoutside the imaginary straight line. Referring to FIG. 9b , the cuttingtip (220) may be also provided so that the central part of the cuttingline (221′) has a concave shape recessed inward than both side edges. Inthis case, the cutting tip (220) may be provided such that based on animaginary straight line connecting both side edges of the cutting line(221′), the cutting line (221′) as a whole is located inside theimaginary straight line. On the other hand, among the boundary linesbetween the main body (210) and the cutting tip (220), the mounting line(222) facing the cutting lines (221, 221′) may be provided to have aconvex curved shape.

In addition, the cutting tip (220) may be provided such that the cuttinglines (221, 221′) have a left-right symmetrical shape based on thecentral part. That is, the cutting tip (210) may be provided such thatthe cutting line has a symmetrical shape based on the central axis (CL).In addition, the cutting bite (220) may be provided such that thecutting line has a symmetrical shape based on the central axis (CL).Hereinafter, the central axis (CL) of the cutting line may be referredto as the central axis of the cutting tip and the central axis of thecutting bite.

Referring to FIGS. 4 to 6, the cutting bite (200) is mounted on therotating wheel (110) such that the central axis (CL) of the cutting tip(220) is inclined at a first angle (θ) with respect to the tangentialdirection (TL) of the rotation locus (R) of the cutting bite (200)formed by rotating the rotating wheel (110). In addition, when aplurality of cutting bites (200) are installed on the rotating wheel(110), each cutting bite (200) is mounted on the rotating wheel (110)such that the central axis (CL) of the cutting tip (220) is inclined ata first angle (θ) with respect to the tangential direction (TL) of therotation locus (R) of the cutting bite (200) formed by rotating therotating wheel (110).

The cutting bite (200) is inclined so that the cutting tip (220) isdisposed closer to the rotation center (C) of the rotating wheel (110)than the case that the central axis (CL) of the cutting tip (220) isparallel to the tangential direction (TL) (FIGS. 5b to 5d ).

Also, the first angle (θ) may be 20° to 35°, and the first angle (θ) maybe 30°.

On the other hand, when the cutting bite (200) is installed so that thecentral axis (CL) of the cutting tip (200) is parallel to the tangentialdirection (TL) as in the past, cracks, at the point A and the point B inFIG. 2, are generated in the film laminate (F) on chamfering. However,when the installation angle of the cutting bite (200) is inclined sothat the cutting tip (220) is disposed closer to the rotation center (C)of the rotating wheel (110) than the case that the central axis (CL) ofthe cutting tip (220) is parallel to the tangential direction (TL) (FIG.5a ), the film laminate (F) may be obliquely cut even at the position Aof FIG. 2, and thus the stress acting on the film laminate (F) may bereduced. Besides, if the inclined installation angle is too large, thecutting angle between the cutting bite and the film laminate becomeslarge, and the cutting property is reduced.

Referring to FIGS. 5a to 6, structural analyses are performed by varyingthe inclined angles of the cutting bite (200) as in FIGS. 5a to 5d , andthe analysis results are as shown in FIG. 6. Particularly, as a resultof comparing maximum plastic strains and stresses acting on the filmlaminate (F), it was confirmed to be appropriate when the first angle(θ) is 20° to 35° on the basis of the maximum stress and it wasconfirmed to be the most excellent when the first angle (θ) is 30°. Inaddition, it was confirmed that when the first angle (θ) is applied to30°, the percent defective is reduced by about 4.5%.

The preferred examples of the present invention as described above aredisclosed for illustrative purposes, which can be modified, changed andadded within thought and scope of the present invention by those skilledin the art and it will be considered that such modification, change andaddition fall within the following claims.

DESCRIPTION OF REFERENCE NUMERALS

100: cutting device

110: rotating wheel

200: cutting bite

210: main body

211: mounting hole

220: cutting tip

221, 221′: cutting line

222: mounting line

1. A cutting device for use in a chamfering process of a film laminate,comprising a rotating wheel having a rotation center; and a cutting bitecomprising a main body mounted on said rotating wheel and a cutting tipprovided on said main body and provided to perform chamfering of thefilm laminate by rotating the rotating wheel, wherein said cutting biteis mounted on the rotating wheel such that the central axis of saidcutting tip is inclined at a first angle with respect to the tangentialdirection of a rotation locus of the cutting bite formed by rotatingsaid rotating wheel.
 2. The cutting device according to claim 1, whereinsaid cutting bite is inclined so that the cutting tip is disposed closerto the rotation center of the rotating wheel than the case that thecentral axis of the cutting tip is parallel to said tangentialdirection.
 3. The cutting device according to claim 1, wherein p1 saidfirst angle is 20° to 35°.
 4. The cutting device according to claim 3,wherein said first angle is 30°.
 5. The cutting device according toclaim 1, wherein the cutting tip is provided such that a cutting linecontacting with the film laminate along the rotation direction of therotating wheel is formed as a curved line, but the central part has aconvex shape protruded outward than both side edges.
 6. The cuttingdevice according to claim 1, wherein the cutting tip is provided suchthat a cutting line contacting with the film laminate along the rotationdirection of the rotating wheel is formed as a curved line, but thecentral part has a concave shape recessed inward than both side edges.7. The cutting device according to claim 5, wherein the cutting tip isprovided such that the cutting line has a symmetrical shape based on thecentral axis.
 8. A cutting device for use in a chamfering process of afilm laminate, comprising a rotating wheel having a rotation center; anda plurality of cutting bites mounted on said rotating wheel, wherein theplurality of cutting bites are mounted apart along the circumferentialdirection of the rotating wheel, each cutting bite comprises a main bodymounted on the rotating wheel and a cutting tip provided on an apicalpart of said main body and provided to perform chamfering by rotatingthe rotating wheel while maintaining a contact condition with the filmlaminate, and said cutting bite is mounted on the rotating wheel suchthat the central axis of said cutting tip is inclined at a first anglewith respect to the tangential direction of a rotation locus of thecutting bite formed by rotating said rotating wheel.
 9. The cuttingdevice according to claim 8, wherein the plurality of cutting bites aremounted at the same angular interval along the circumferential directionof the rotating wheel.
 10. The cutting device according to claim 8,wherein at least two cutting bites are each mounted at differentdistances from the rotation center along the radial direction of therotating wheel.
 11. The cutting device according to claim 8, wherein atleast two cutting bites are each mounted at the same distance from therotation center along the radial direction of the rotating wheel. 12.The cutting device according to claim 8, wherein each cutting bite isprovided such that the cutting tip is exposed in the same directionbased on the rotation direction of the rotating wheel.
 13. The cuttingdevice according to claim 8, wherein said cutting bite is inclined sothat the cutting tip is disposed closer to the rotation center of therotating wheel than the case that the central axis of the cutting tip isparallel to said tangential direction.
 14. The cutting device accordingto claim 8, wherein said first angle is 20° to 35°.
 15. The cuttingdevice according to claim 14, wherein said first angle is 30°.
 16. Thecutting device according to claim 8, wherein the cutting tip is providedsuch that a cutting line contacting with the film laminate along therotation direction of the rotating wheel is formed as a curved line, butthe central part has a convex shape protruded outward than both sideedges.
 17. The cutting device according to claim 8, wherein the cuttingtip is provided such that a cutting line contacting with the filmlaminate along the rotation direction of the rotating wheel is formed asa curved line, but the central part has a concave shape recessed inwardthan both side edges.
 18. A chamfering machine, comprising a transferunit for transferring a film laminate; the cutting devices according toclaim 1 disposed on both sides along a transfer direction of thetransfer unit, respectively; and a drive part for rotating said cuttingdevices.